Sock



FIG. 1 is a bottom perspective view of a sock showing my new design, shown as worn;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a left side view thereof, the right side view being a mirror image of the left side.

The broken lines showing of the portions of the sock are included for the purpose of illustration only and form no part of the claimed design. 

CLAIM The ornamental design for a sock, as shown and described. 